Warning: Java component download site infected with malware

On clicking a SyGem link, Avira flagged a virus but the computer was infected. I suspect multiple malware and that the infection resulted from a virus/adware that went undetected by Avira

The symptoms observed are regular popping up of the default browser with advertising pages, and corruption of Windows7 desktop gadgets, with the clock showing as a black square with a second hand pointing straight up

Downloaded and installed Ad-Aware, which flagged and removed 10 malware objects. During the scan it halted the process zrr.exe several times.

With guidance from various Microsoft and third party help/support sites I removed the registry folder